diff options
author | Serge Hallyn <serge@hallyn.com> | 2008-02-29 15:14:57 +0000 |
---|---|---|
committer | Chris Wright <chrisw@sous-sol.org> | 2008-04-18 18:53:30 -0700 |
commit | 44996dccd89ce86c7c38e37e0635d30c66279772 (patch) | |
tree | 6c07faa687a71f06d0e1454c305543f5c059bb58 /include | |
parent | d7d835ba45a0a2b30ed47887275e271e9ddddbdb (diff) |
file capabilities: remove cap_task_kill()
upstream commit: aedb60a67c10a0861af179725d060765262ba0fb
The original justification for cap_task_kill() was as follows:
check_kill_permission() does appropriate uid equivalence checks.
However with file capabilities it becomes possible for an
unprivileged user to execute a file with file capabilities
resulting in a more privileged task with the same uid.
However now that cap_task_kill() always returns 0 (permission
granted) when p->uid==current->uid, the whole hook is worthless,
and only likely to create more subtle problems in the corner cases
where it might still be called but return -EPERM. Those cases
are basically when uids are different but euid/suid is equivalent
as per the check in check_kill_permission().
One example of a still-broken application is 'at' for non-root users.
This patch removes cap_task_kill().
Signed-off-by: Serge Hallyn <serge@hallyn.com>
Acked-by: Andrew G. Morgan <morgan@kernel.org>
Earlier-version-tested-by: Luiz Fernando N. Capitulino <lcapitulino@mandriva.com.br>
Acked-by: Casey Schaufler <casey@schaufler-ca.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
[chrisw@sous-sol.org: backport to 2.6.24.4]
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Diffstat (limited to 'include')
-rw-r--r-- | include/linux/security.h | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/include/linux/security.h b/include/linux/security.h index ac050830a873..d842ee36e54d 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -62,7 +62,6 @@ extern int cap_inode_need_killpriv(struct dentry *dentry); extern int cap_inode_killpriv(struct dentry *dentry); extern int cap_task_post_setuid (uid_t old_ruid, uid_t old_euid, uid_t old_suid, int flags); extern void cap_task_reparent_to_init (struct task_struct *p); -extern int cap_task_kill(struct task_struct *p, struct siginfo *info, int sig, u32 secid); extern int cap_task_setscheduler (struct task_struct *p, int policy, struct sched_param *lp); extern int cap_task_setioprio (struct task_struct *p, int ioprio); extern int cap_task_setnice (struct task_struct *p, int nice); @@ -2112,7 +2111,7 @@ static inline int security_task_kill (struct task_struct *p, struct siginfo *info, int sig, u32 secid) { - return cap_task_kill(p, info, sig, secid); + return 0; } static inline int security_task_wait (struct task_struct *p) |